Properties

Is a {{domxref("DOMString")}} containing the value of the {{cssxref("animation-name")}} CSS property associated with the transition.

{{domxref("AnimationEvent.elapsedTime")}} {{readonlyInline}}

Is a float giving the amount of time the animation has been running, in seconds, when this event fired, excluding any time the animation was paused. For an "animationstart" event, elapsedTime is 0.0 unless there was a negative value for {{cssxref("animation-delay")}}, in which case the event will be fired with elapsedTime containing (-1 * delay).

{{domxref("AnimationEvent.pseudoElement")}} {{readonlyInline}}

Is a {{domxref("DOMString")}}, starting with '::', containing the name of the pseudo-element the animation runs on. If the animation doesn't run on a pseudo-element but on the element, an empty string: ''.